In my 50's now. Raised as a Catholic. Discounted all that as bullshit at 12 and started off on a spiritual quest.
I do believe in Buddhist doctrine these days, but I'd hesitate to call myself a Buddhist.
There's a lot of empirical scientific evidence to prove that reincarnation is a thing outside of religious belief, the main source being Dr. Ian Stevenson's work.
I did regression hypnosis, and couldn't believe how stupid 'I' was in my past lives. I don't think could have been friends with any of those people!
In short, it all comes down to the First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed.
I believe consciousness is such an energy, but ego and id are disposable constructs that get discarded upon death.