My input as somebody who is 55 this year, 80.5 kgs BW / 205kgs deadlift
Most of life with lower back issues ( motorcycle crash in 1983 - split a fibreglass AGV helmet in two ) didn’t start heavy dead’s until mid 40’s because I was always cautious of my bad back.
Heavy deadlifts transformed my life.
Until I started lifting heavy I was constantly plagued with lower back pain. Off and on I would be taking 400 mg of ibuprofen just to get out of bed in the morning. By off and on I mean six months of the year every year for best part of 30 years.
For some very odd reason that I can’t actually explain, I decided to work on deadlifts.
Basically transformed my lower back pain which in turn transformed my life.
I genuinely haven’t suffered with my lower back in the last decade and I am absolutely attribute that to heavy deadlifts.
To be clear when I started my deadlifts was probably less than 100 kg. It’s built up over time and I’m quite comfortable to multiples at 180/ 190.
I now have various weightlifting, Olympic lifting and personal training qualifications always emphasise the benefit of deadlifts anybody I work with who is over 40.
As a compound movement (or indeed any movement) it simply cannot be surpassed for the stress it across the whole body, which in turn builds stronger bodies
No matter what your age you can benefit from deadlifts (which was basically the LPs original question) .
Granted when you’re my age or even older ( I work with guy who 78) the level of intensity is going to be reduced but the benefits still play out.
Anyway just my thoughts.
Lift heavy, love a lot, and have fun
(Apologies for typos/grammatical errors I’m dyslexic)