-current is a moving target. Yes, you are out-of-sync. But ... how old is this elderly kernel? Days? Weeks? Months? Unless your userland issues a new syscall that is not in your kernel, or, issues a new option to a syscall that is not in your kernel, you should not see significant problems. If the older kernel is only days old, then you should feel confident.
Note: right now the ports tree is locked, 4.5-beta has completed, final bugs are being worked on (the src tree is effectively locked except for 4.5-release work), and 4.5-release is within days of being tagged.
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