As an aging person I suggest: Don’t use the word older. Or senior. 
Experienced would be better. Wise would be even better. Fermented wouldn’t work, but elegant, refined, or opulent would be better wine analogies. How about Falernian or Surrentine, if you are inclined toward pedanticism. Over-the-hill is insensitive while venerable adds some sophistication to the aging process.  Old-bat is a no-no, but mature might be a hit for some. Ripe, no. Cultured, yes. Seasoned is OK, but graceful is better.   How about resolute or durable instead of old boot?