: There are themed paper goods and cards, such as the "You're Old Babe" card from Hitchcock Paper Co. , typically used for birthdays.
: This is a collection of short stories by Margaret Atwood, which explores themes of aging and relationships. It is available through major book retailers like Amazon . maturebabe
If you are actually looking to a long paper (essay or research project) related to mature themes or individuals: : There are themed paper goods and cards,
: Authority sites like eLife provide data-heavy papers on long-term trends in adult development, such as historical changes in human height. maturebabe