Gerry understands that his personal list of vocabulary words has the potential to build over his lifetime, but his ability to increase his marathon pace from its peak at age 28 has limits. this suggests gerry recognizes that development across one's lifespan is characterized by both and

- Gains; losses.

Explanation:

Development is the process that is associated with the 'overall growth of an individual' which continues throughout human life. However, the development of physical abilities is restricted to a certain age as illustrated through example 'Gerry knows that his ability to improve his marathon pace is limited up to the age of 28'. While he also understands that 'he could build or enhance his vocabulary over his lifetime' as it is associated with cognitive or psychological development. This reflects that Gerry came to know that development across our life is distinguished by both 'gains'(intellectual ability) and 'losses'(physical abilities with time).

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