Thank you!

I think around 4-5 years or so like with the 8 Plus would be ideal.

I've had my iPhone 8 Plus since the end of 2018 and and has been holding up, but it's now showing its age with a 74% battery capacity, it gets random freezes from time to time... but it's still pretty much usable.

I've been looking at upgrading to something like the iPhone 13 (new) for the past few months, but with even trading my 8 Plus it would be more than 800€ for a base model. Now, a close friend of mine needs the money and is seelling his iPhone 11 Pro 256GB for 500€ which I think is fair. The battery was replaced a year ago or so and it's currently at 94%, the phone itself is like new.

I'm not really a heavy user anymore and I try to use my phone as less as possible. Not even using social media lately, I'm currently in a digital detox kind of.

Do you guys think it's worth it for me to upgrade to the 11 Pro or should I just aim for the 13 for example, to future proof?