Hi Steve, another "Geezer" here.
Started out with piano, and self taught keyboards while fairly young, but did not stay with it. Learned just enough standard notation to play what I wanted to, albeit s l o w l y. Still can't "sight read".... but am able to muddle through if needed. Really did not find much value in TAB when starting guitar (close to 40 years ago), but learned to read and use it, as for a long time it was the easiest alternative to sheet music out there, especially for learning lead riffs. The other advantage to TAB is that you don't "have to" learn the positions on the fretboard of every note.... although it is really helpful to. The Nashville Number System.... if it works for you, use it. For me it is just another thing to learn, and I'm getting too old and lazy to work that hard at it.
But in the end it is a good thing IMO to learn as many different ways of notation as you can. Not every tune you would like to learn will be conveniently packaged in the color of your preference.
It's still easier for me to go to the keys when figuring out a tune and once I have it down on keyboards, go to the strings.... Haven't figured out why yet but it is likely a character flaw.
Thanks and Take Care;
Doug