The 2014 model I bought in early 2015 still works, though the battery is dodgy. I did get the motherboard replaced in 2020 which was pricey, but much cheaper th

The 2014 model I bought in early 2015 still works, though the battery is dodgy. I did get the motherboard replaced in 2020 which was pricey, but much cheaper than a new machine. Is there some reason your current computer isn't working for you? If not, why upgrade? Use it as long as you can do so practically & easily. On the other extreme, I knew someone who bought a new MBP with maximum RAM specs each year. She'd sell the old one for a few hundred less than she paid, then she always had new hardware with applecare. It was basically like leasing a machine for $400/yr.