On age and driver's license, my grandmother had hers up into her 80's she was required to go annually to renew them the last decade or so. My great grandfather had his until he passed away at 97, he had a complete physical 6 months before he died perfect health and vision. What I still think got him was family of 3rd wife got them placed in retirement home to get his property and not let him alone. Now, my mother had hers took around hers late 60's and my sister not had a D/L since her heart attack and has vision problems also.