Why can a lower limit on age to participate in elections be constitutional but an upper limit not? You need to be 18 to vote and 35 to be president but we can’t legislate an upper age limit on running for office?
It’s because of the constitution. The most fundamental laws of the land are expressed in the constitution, and nothing else can override them. In the US, the 26th amendment establishes the minimum age of 18 for voting (https://en.wikipedia.org/wiki/Twenty-sixth_Amendment_to_the_...) and Article II, Section 1, Clause 5 of the constitution establishes the age of 35 for presidency. However, a constitutional amendment (which is difficult to pass with today’s political divide) could theoretically change that.
