
Retirement is a journey of continuous adaptation, marked by both joys and challenges, where finding happiness requires embracing change and seeking personal fulfillment.


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Money, mediocrity, the entropy of aging, myths of meaning, and yes … the inescapable Reaper.

Three Years Retired: Secrets of Happiness, Reality, and the Inevitable

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Reflections on Three Years of Retirement: Happiness, Challenges, and Personal Growth


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The article poignantly portrays the challenges and emotions associated with witnessing a once-strong parent grapple with age-related decline.


You only think about when you’ll next get sex

When You Are Young You Never Think about Death

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Helping My Aging Father: A Poignant Glimpse into His Decline



隨著年齡增長，人體血液中的循環因子會改變，進而影響周邊細胞的晝夜節律，可能導致與老化相關的健康問題和疾病。


Aging is associated with a number of physiologic changes including perturbed circadian rhythms; however, mechanisms by which rhythms are altered remain unknown. To test the idea that circulating factors mediate age-dependent changes in peripheral rhythms, we compared the ability of human serum from young and old individuals to synchronize circadian rhythms in culture. We collected blood from apparently healthy young (age 25-30) and old (age 70-76) individuals at 14:00 and used the serum to synchronize cultured fibroblasts. We found that young and old sera are equally competent at initiating robust ∼24h oscillations of a luciferase reporter driven by clock gene promoter. However, cyclic gene expression is affected, such that young and old sera promote cycling of different sets of genes. Genes that lose rhythmicity with old serum entrainment are associated with oxidative phosphorylation and Alzheimer’s Disease as identified by STRING and IPA analyses. Conversely, the expression of cycling genes associated with cholesterol biosynthesis increased in the cells entrained with old serum. Genes involved in the cell cycle and transcription/translation remain rhythmic in both conditions. We did not observe a global difference in the distribution of phase between groups, but found that peak expression of several clock-controlled genes ( PER3, NR1D1, NR1D2, CRY1, CRY2, and TEF ) lagged in the cells synchronized ex vivo with old serum. Taken together, these findings demonstrate that age-dependent blood-borne factors affect circadian rhythms in peripheral cells and have the potential to impact health and disease via maintaining or disrupting rhythms respectively.

### Competing Interest Statement

The authors have declared no competing interest.

Evidence for a role of human blood-borne factors in mediating age-associated changes in molecular circadian rhythms

人類血液因子在調節與年齡相關的分子晝夜節律變化中的作用證據


Older adults can embody exceptional aging experiences marked by wisdom, creativity, and community engagement, challenging negative stereotypes about aging.


Joyful, meaningful aging requires taking a fresh look at your identity and the new possibilities ahead

Older Adults Need an Attitude Adjustment

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Challenging Negative Perceptions: Exploring the Richness and Depth of Exceptional Aging Experiences



The golden years between 65 and 105 can be a time of fulfillment, self-discovery, and meaningful contribution.


Enjoying the repair age and the do stage between age 65 and 105.

What We Were Made For

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Exploring the Joys of the "Repair Age" and the "Do Stage" in Later Life



The concept of "successful aging" can be problematic as it often carries biases and fails to account for the nuances of growing older.


Reflections on Three Years of Retirement: Happiness, Challenges, and Personal Growth

Helping My Aging Father: A Poignant Glimpse into His Decline

人類血液因子在調節與年齡相關的分子晝夜節律變化中的作用證據

Challenging Negative Perceptions: Exploring the Richness and Depth of Exceptional Aging Experiences

Exploring the Joys of the "Repair Age" and the "Do Stage" in Later Life

The Problematic Concept of "Successful Aging" and Its Biases