Hey Kim,
I started about 9 months ago at 45 and have just joined my first band. So no - not too old at all.
Here are pointers from my first year
1 - Buy some XL88 or GHS fast Fret. Do this right now. Best $20 I ever spent on bass.
2 - I wouldn't spend money on lessons at first. Learn the basics from a youtube course or an app. Check out the yousician app. You can use it for 15 mins a day for free or get a subscription for more time. For the same price of a 1 hour lesson your will get 100's of hours of play from a course/app.
3 - Don't let your new status prevent you from trying to find other players. (learn some ACDC and other easy songs - ACDC seems to universally known by everyone.) Also be up front about your ability. I let people know i'm a web designer - not a musician and have been playing for 1 year. I play bass for fun not my career - but do take it seriously - but I don't understand most music theory and still nowhere near having the fretboard memorized. I found 90% of the people I met are cool and alot in the same situation - but there are 'unemployed rockstars' out there with attitudes. You'll want to avoid these types. Best they stay in a basement somewhere.
Strongly disagree on pt2.
It is hard for people to understand the importance of introducting first lessons on a bass guitar without achieving a high level of playing on a specific instrument first, to then really understand the issue.
It is hard for a starter to nail down the position technique well without constantly checking yourself in the mirror and being self critical enough ro really correct yourself everytime you make a mistake to really benefit from it in a relative amount of time.
I started out as a self taught bass player after switching from piano. Played for almost 10 years before I was accepted to bachelor studies at my music academy in Austria. I remember my first lesson very well, when my professor told me to play a couple tunes. "Yea man, you have a nice tone, great timing, but your technique is just really bad. We gotta work on it asap."
I literally spent my whole first year re-learning my finger technique and try to unlearn mostly everything I have "learned" in the past 10 years.
This is a lengthy process and takes a strong will to relearn somethink you think you know already, rather then spending a couple bucks to have quality forst time lessons and learning the trait properly in the first go and never have to worry about it.
As a result I have spent a whole year just practicig scales and carefully watching my fingers and position, cca 7-8 hours a day. At the end of the year, professor told me my hand technique now looked like a text book example.
I never understood the technique I was about to learn until I did. Now I realise obviously just how crappy my technique actually was and how much it slowed my progress in terms of precision of playing and speed of execution.
I get a lot of students with this problem and students that fon't want to listen and don't work on their technique until they realise they screwed it or even worse, they start thinking they are not up for the job and quit it alltogether.
It also makes the teaching process complicated since I have to usually spend a grwat portion of lessons i the first year or two just to correct the students bad technique habits. And most of them never get it why. Those who happen to progress with bass playing much further do come back and thank me for it though.
Good technique is a fundament to the bass playing guys!! Its where the tone comes from!
Obviously there are a number of valid techniques and styles of playing but there are certain checkpoints that you absolutely must master if you ever wish having your finger and positional technique figured out.
So no, if you can afford it, don't think twice, get yourself a quality teacher ASAP.