If I understand the question correctly, you're asking whether there are term limits for US Senators. If so, the answer is no--Senators can continue to serve as long as they continue to be reelected.
No Limit
The Senate terms are 6 years, but no limit on the number of a times a person can be elected to the Senate.
There is no limit.
There is currently no term limit for U.S. Senators or Representatives.
yes.
cloture
Each term lasts six years, and there is no limit to the number of terms a senator can have.
There is no limit.
cloture
There is no limit.
Yes this is true.
the minimum age limit for senate is 25