I have an iphone 8 - 64g which I bought 2018, now it works fine although sometimes it is stuck but generally fine.

Also, the 100% battery only lasts 4-5 hours when I was travelling that's why I needed to carry a charger.

If you want to keep your iphone in a good condition it is better keep the battery between 20-80% for the best health.

Now the biggest problem is that the phone memory is not enough because I have a lot of photos, when I will change the mobile I will consider 128g.

The one that has lasted me the longest was the 8 plus, it lasted me 3 years and I changed it because I wanted to, not because I needed it.

Cell phones are very durable if you take care of them.