My 12 year old will often stumble as he gets up and down from his bed, he needs a while to get his "sea legs" once he is steady he is usually fine.
He doesn't have the skin tags but has had a wart appear on his head, it doesn't show up much and doesn't bother him so we've let it be.
Jasper was 12 in March just gone and has been to the vet maybe 5 times in all those years, most of those visits were after a car accident he was in aged around 4, I feed him well, exercise him gently with what I know he is comfortable with and don't allow my youngsters to bother him.
He is growing old gracefully and though it saddens me to watch him slow down and not have the body to keep up with the mind, I am happy knowing that he is happy and enjoying life at his new pace.
I lost a lab a year ago aged 11, but he was diabetic and blind and had other related complications, both the dog and I knew it was time and we sadly made the decision to help him to the bridge.