I always have older players in my teams, they are cheaper, no bidding wars on them, and do well.
My Best strikers ever were older players.

I also have a scout ST he is on the 4th season, 25 years old, 5*, top scorer and top assister in the last 2 seasons, in the first he only played half the season.
In this point i only bought him because he was 22, near the 7*, so i knew i could keep him a few seasons. If i can keep him 6 or 7 seasons 50T is not a bad price.