My thoughts on it should be that a politician can serve until the full retirement age as defined by the federal government, which is currently 67. Mental decline in later life is definitely a thing and I don’t feel like people who are in the age range for mental decline should be running the country.
My thoughts on the congressional salary is that it should be a multiplier of the minimum wage and congress can’t change that multiplier. They want a raise? Then they have to raise the minimum wage for everyone