24 y/o boyfriend low sex drive?

I’ve been with my partner for a year now (6 months officially). At the beginning we would have sex a lot, every time I would see him we would have sex even a couple of times a day, so quite a few times a week. Recently his sex drive has been quite low, the most we’ve been having sex in the last few months would be once or rarely twice a week. This isn’t a massive problem with my confidence at the moment (starting to naturally question it to myself a bit though) but my sex drive is a lot higher than his, so it is quite sexually frustrating for me sometimes. A lot of the time it will be me attempting to start something and him not really wanting to. I came back from a 2 week holiday a week ago and he desperately wanted to have sex with me, couldn’t wait and then after that one time he’s not really bothered to.

There is a 5 year age difference (19, 24) I just want to know if it’s normal and what sex drives are like for his age.
24 y/o boyfriend low sex drive?
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