Is form 1040-SR for seniors available this year?

Yes, if you are age 65 or older the Form 1040-SR is available in the TurboTax 2022 editions.

Yes.   If you are 65 or older your return will be on a Form 1040SR.  The 1040SR is identical to the "regular" Form 1040 except that the print is bigger so it spreads over three pages instead of only two.   The lines are numbered exactly the same and all of the calculations are done exactly the same way.  Your refund or tax due is not affected in any way by using one or the other.  The software uses the date of birth you enter in My Info to determine whether to use the 1040SR or 1040.

FYI - When you print it will print on the 1040SR even if you see only the 1040 on the screen.  You automatically get the 1040SR if you or your spouse is 65 or older.  In the Desktop program you can tell it which one to print.