Why not take up drinking good red wine - you'll get more zing for your bling, or bang for your buck!!
Seriously, I reckon we are about the same age or age level (I'm >>70 but still healthy and active, tho' no longer happy to carry a backpack full of FX Nikon gear with me around Southeast Asia), and we may both be suffering from the same malaise, post-Covid isolation boredom.
As I see it, investing in LF at this time is akin to throwing away a bucket of money. You'll spend up big, but if you decide it isn't for you and you want to bail out, your chances of getting more than half what you put into it are, in two words, almost zilch. Think... Ebay. Dunno about you, but not for me.
My "solution" was to invest a reasonable amount of money (<AUD$3000) in a like-new Fujifilm XT2 and four beaut Fujinon lenses. I had avoided DX like the plague for the past decade, opting instead to pour my money into Nikon FX, D700s and now D800s plus a shipload of lenses. I still enjoy using these, but at the ripe old age of (almost) 75, carrying a D800 and a bag of lenses doesn't excite me much, if anything can be said to "excite" me at my age. Ha!!
My partner was sufficiently impressed with the XT2 that we now also own a secondhand XE2, also a superb smaller camera to play with. So I get to carry two in my backpack when I go bush, along with the lenses, and I can still walk after being out in the great outdoors all day. Win-win!!
My slow photography urges are catered for by using one of my four Rolleiflex TLRs, even tho' with the price of 120 film in Australia nowadays, when I've used up the stocks of it I have left in my darkroom fridge, that will pretty much be it for me and MF.
I also have a darkroom, but am quietly running down my stocks of everything, paper and chemicals, which should take me another 1-2 years. After that, well, who knows - a rocking chair, maybe, and a nice wool blanket for our two pussies to lie on in my lap. And old movies on YouTube. Amazing what ends up on that site - last night's opus was 'The Road To Singapore', a 1931 William Powell-Warner Brother love thriller, pre-Code so with some fairly sizzling scenes in it.
Sounds depressing, dunnit?? The red wine helps, but again, given that OA is pretty much a state of giving up things, sooner or later I'll be faced with giving that up too, before it gives me up.
The XT2 has rekindled my interest in casual/candid photography and given me new play-toys to take out and reshoot all the nice things I've been photographing over the past 22 years.
To be a little more positive about this, you have so many options open to you. Pick one or two you think you would enjoy, and go with it. Oh, and let us know how it all goes...