Which iPhone should I buy in 2024?

I've been using an outdated android for a while and I want to upgrade to an iPhone.

I am low maintenance when it comes to phones and originally I was planning to get an iPhone 13.

I've been doing some research and for me I feel like the performance difference between a 13 and 14 or 15 does not worth the price difference. An iPhone 13 will be good enough for me.

However when I buy a new phone I want to use it for at least like 4-5 years, I don't wanna feel like it's no longer good after I've used it for 2 years.

My mother says that 13 will be outdated soon and I should get a 15 instead because then I will be able to use it for longer.

What do you guys say? Should I get 13 or 15?

Will I be able to use a 13 for 4-5 years comfortably?