A person who begins to find large family gatherings overwhelming in late adulthood may choose to attend fewer of them so that they can enjoy the occasions more, and be sure to get extra rest before a gathering occurs. According to Baltes and his colleagues' model for adaption in late adulthood, which of the following is closest to optimization?
enjoying each occasion more

Selective Optimization With Compensation is a strategy for improving health and wellbeing in older adults and it is also a model for successful aging. It is recommended that people in their late adulthood select and optimize their best abilities and most intact functions and compensates for their declines and losses.

Baltes and his wife Margret proposed this theory. "Theory of s systemic metatheory of ontogeny which characterizes lifespan development as the orchestration of three processes: selection, optimization, and compensation".

(The SOC model)

According to the SOC model, successful aging includes selection of functional domains where one focuses on his resources,

optimizing developmental potential that is maximization of gains and compensating for losses thereby ensuring the maintenance of functioning and a minimization of losses.

Recall that optimization is all about maximizing gains and making up for potential losses, to achieve the “best” design relative to a set of prioritized criteria or constraints. Examples of factors to maximize are productivity, strength, reliability, longevity, efficiency and others.

So choosing to attend fewer gatherings is the closest statement to Optimization.