I bought my first property in 2010 (an REO that needed a LOT of work). I got my 2nd this past spring (it needed even MORE work). Both are long-term buy/hold rentals. I'm currently 55, and I did the rehabs myself --some solo or working alongside hired labor(cleaning, painting, installing counters, flooring) some tasks I had done by skilled tradesmen (toilet removal, heater installation, drywall). I LOVED bringing houses "back from the dead" and providing good quality low-income housing in the small town where my parents live. It's not been particularly good cash-flow, since I've been plowing everything back into RE, but I've done quite nicely on equity gains & tax deductions. I'm also working with rural, low-income property, which have a high time/income ratio (it's inexpensive, and while the cash-on-cash return is quite good, the numbers are small all the way around, and it's more effort than some other classes of RE).
I would say sit yourself down & think what your strengths/non-strong points are. You are old enough to know who you are, and life is too short to do things you hate. If you have a real knack for decor & hospitality (not just your opinion, but your friends & family have always commented on how nice your house looks), maybe airbnb or renting rooms out in a house (not necessarily your own home-- there is a real need for single people to have housing, & communal housing is a thing. If you (or your dogs) don't like sharing your space a duplex might be a reasonable idea, or a house with a rental court. My parents own a house that has 3 tiny, (but nice) rental cottages on the property that were converted camping cabins. People ask about vacancies all the time, but their tenants stay years. If you LOVE hammers, saws, & plumbing just inherently makes sense to you, by all means dive into a rehab (but make sure to buy at wholesale, not retail).
Also, if you are not a "people person" PLEASE don't try to be a landlord! Buy property and have it managed, invest in notes, do REIT, whatever. You'll only cause misery for yourself AND your tenants if you don't like dealing with people.
Age also does affect your investment choices in ways that 20 year olds don't have to think about; for instance, if you live in a multi-unit it qualifies as your residence, for the purposes of Medicare, and it is NOT a countable asset when assessing your ability to pay for care (though you should look up all the details, and they may change in the future). You may also have to analyse whether prospective properties could reasonably be managed by either your family, or a management company. Exit stratagies become more important as you get older -- though there are worse things than getting your children into RE as long as they have any kind of knack for it!