They may need to take a break a bit more often than younger travelers. All in all, airlines are reasonably senior-friendly. I recently wrote a report on the way the big airlines help older seniors, who might be a bit confused, through the hassles of changing planes at a hub airport. On board, seniors flying Coach get the same treatment younger travelers get generally bad. Seniors who might have to get up from their seats a bit more often than younger travelers should fly American when they can, since its extra legroom makes getting up and down a bit easier than on other lines.
Rail systems are a mixed bag.
Other than ramps for disabled travelers, few offer any special facilities. Getting on and off is the major challenge for senior travelers. The most senior-friendly systems use platforms on the same level as the floors of rail cars. Elsewhere, you may have to heave your baggage up several feet from platform to the car. And, in many train stations around the world, you have to climb a lot of stairs.