NO-as was clearly stated in the very 1st post in this thread. Ceased late last yr. Also posted on seat61. However-maybe explaining the confusion- domestic NMBS/SNCB tix to BRU as ´any station in urban zone´-as is also the case for all other larger cities with more as 1 station.
As for senior/65+: up till now its a return, from 9.00 mo-fr, at a flat price. The normal BE rise in fares (linked to the statistic figure for inflation-as are also salaries and many other govmtal things in BE) is on 1/2 coming and I´ve read somewhere, but not seen confirmed, that the senior discount will from then on be 40% OFF from full fare=making it more usefull for short trips and singles, but rising the price for longer distance-still a very good offer in all. In fact for those that lucky in age-it was always cheaper as the €* add-on. NMBS is clearly busy in checking all their very cheap special offers and ceasing or adjusting them to find some more revenue from customers paying. Trains there-as in NL, remain just as in UK Southern or other suburbans: just walk on, no need for advance or fone-fiddling etc.-but stand up in very busy times.
Its off-topic, but for those interested in other transports: the Wallon (FR speaking area) bus-comp TEC (has also trams in the Charleroi area and coming back in Liége-town) offers for seniors a yearly pass for less as 20€-for anyone. But also have to pay for the MoBiB chipcard 1st time-bring foto to have them make it up (cost 5€, I think). About cost of 2 daypasses on them.
In Flanders there is deLIJN-has kind of same but at much higher price.