Many of us old farts started with building from scratch or from a kit. putting the sticks together is very satisfying, flying something you built yourself is also satisfying.

But be aware that it will cost you more to build than to buy a ready to fly. Maybe twice as much.

If I had to recommend something to build it is hard to go wrong with a Telemaster. Available in a range of sizes as laser cut kits. It is also an excellent trainer.