~snip~
It really depends on your perspective. From a historical standpoint, new users are actually quite late to the Bitcoin party – the currency has been around for over eight years now. However, from a more speculative standpoint, new users may still be early to the party as Bitcoin's value could potentially continue to rise in the future. So it really depends on your outlook and investment goals!
Since Bitcoin started in 2009 publicly, then that makes it 13 years old. So, yeah, new users are dealing with a more mature Bitcoin than a decade ago.
But there's also the fact that because of its maturity, that meas it's safer to say that it will stay here for a long time.
Basically the longer something exists, the larger probability it has to continue existing.
Also, the fundamentals of Bitcoin haven't changed.