This.
I put 40 or so in a gallon zip lock. Spray liberally with “One Shot”. Shake & roll around, spray till they are coated nicely. Resize.
Fast & Effective.
I don’t know about that big of a field, but on my lawn Dimension pre-emergent herbicide works well.
You put it down in early spring before the broadleaf weeds sprout. Doesn’t kill the lawn, just prevents weeds from coming up...
Ignore what your scans/xray say. Seriously. Focusing on how bad they look can get you into a pity party.
Lose some weight and stay active. Some pain management may help you to stay active. Avoid the surgeries.
You aren’t taking into account the growth he made with that extra $2500 pre tax money. Pre tax 401k you are achieving growth with some of Uncle Sam’s money , so to speak.