No idea how old it is but I do know the previous owner kept cichlids in it and was none too careful about the glass... The lower section is a bit riddled with scratches but I'm not too bothered at this stage - for Â£100 it's potentially disposable if I decide I want to stick with this size tank in the long term (at which point I'd replace it with new).
I too bought my 120x50 Rena Classic from ebay - at Â£300 it was more expensive than yours. Ill console myself with the fact that there was a T5 luminaire thrown in with fresh tubes and plenty of tank spares, so i cant complain too much!
It was also in pretty good condition too...
Reaching the bottom is a trial - but as the tank was sold with decent grabbers then i dont see that as too much of an issue! At 6'3" i also have fairly long arms!
I'm always amazed by the construction of the cabinets supplied with tanks and the lack of instruction re getting the floor absolutely level - especially left to right. In the longer term my tank will be situated on a built in cabinet - sturdy timbers behind an elegant, solid wood (probably Cherry) face frame.