Until what age do Buddhists live

I think it doesn't matter how old you are if you have a Bodhi heart.

　Thank you for your question. Our sect (Jodo Shinshu Honganji school) can join the Buddhist sect at any age, but it is necessary to understand a lot of things before doing ascetic practice (devotion), but it's really hard not being able to remember. There are also people who get sick just because it's tough due to training (degree), but I think they can surpass it if they do their best. Kusasa

If the meaning of the question about entering the Buddhist sect means becoming a member of the monks, the minimum age from what age is possible differs from sect to sect (for example, the Jodo Shinshu starts at 9 years old, the Jodo sect starts at 6 years old, the Koyasan Shingon sect is elementary school student or older...), but there is basically no age until what age.
However, what would you like to do as a monk after that? What meaning do you want your life to have? It's different.
After getting a degree, go through the teaching program, what kind of specialty do you then advance to, and what do you want to work in? In that respect, there are cases where there is a limit on the age of admission to specialized courses for that purpose, such as up to 40 years old or up to 45 years old.
In other words, for example, those who started at age 60 and those who started at age 15 are the same rookie monks, but those who started at 15 go on to the teacher course at age 20, and there are options such as going on to courses such as worship, evangelism, and teaching, etc., and there are also school-like training dojo-like ones, but if you start 45 years late, there are no options in terms of age after that, and qualifications etc. cannot be obtained. There are also age restrictions, such as religious clerics who work within the sect, being unable to apply because there is a recruitment age limit.
Age doesn't matter if it's just about entering the Buddhist sect, but what do you want to do after entering the Buddhist sect? When it comes to that, age may also have something to do with it.
Also, finding someone who will become a master and monk before getting started (the temple you belong to) is a major challenge before getting started. Also, what to do with tuition and living expenses after getting started will also be an issue.