Mention the fact that you're a senior when you make your travel reservations. By far the best way to get around in the Benelux lands is by public transportation -- metro trains, trams, and buses for short journeys, and trains for longer journeys. All three countries offer discounts for seniors on public transportation. For train travel, these discounts begin at age 65 in Belgium, and at age 60 in Holland and Luxembourg. Bus companies may have different starting ages for discounted tickets and passes. Many sightseeing attractions and tour companies offer senior discounts, but these might apply only to local residents when they produce an appropriate ID. Be sure to ask when you buy your ticket.
A group of local seniors run so-called "Mee in Mokum" guided tours on foot through Amsterdam -- "Mokum" is the name Amsterdam's once-thriving Jewish community used for the city, and it's still used informally by the populace. The name means something like "Going With Amsterdam." People of any age can go on the tours, which are not exclusively for seniors, but the fact that they are led by seniors makes it more likely that the pace will be suitable. The guides speak English and know their beloved city inside out, as you might expect from people who have lived there for decades. Tours depart Tuesday to Sunday from the David & Goliath restaurant, Kalverstraat 92 (at the Amsterdams Historisch Museum); they last 2 to 3 hours and cost 4€ ($6.40). You can reach the guides at tel. 020/625-1390, or look them up at www.gildeamsterdam.nl.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.