No difference really, friendship/etc before 24 are moot. Before age 24 the person can experience "major life revelations" every 2 years; Puberty/end of puberty - height weight... Etc
Which doesn't not make long term matching impossible, but rarer.
25 up has more experience handling their own obligations during their own changes. So adapting to being a good partner while being a good partner starts around then.
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