Is it possible for someone in their 40s to become an intermediate-to-above player?

I realise that people can learn to play the guitar at any age, but I'm wondering as a 48-year-old person, who has been playing for around two years, whether the mountain to being more than passable is too steep to climb in your 40s.

I have improved over the past two years, but it's dispiriting to think that I might never be able to play a more complex song to a good standard.