1969 B747 first flight, Man walked on the Moon, Concorde first flight in UK...and I completed my Flying Scholarship to PPL...fast forward to 2016 and retirement
When I converted from the DC8 to the B707 it was like going from a Bentley to a Ford. When I converted from the B707 to the B747 in 1983 it was like going from a Ford to a Rolls Royce (with 4 RB211s).
Since then I have flown the B747-100, 200, 300, 400, SP & Freighter with RR, P & W and GE...the ultimate is the 400 with GEs.
21,000 hours total plus 4,000 in simulators with 15,500 on 747s, 11,000 on the 400 and in all that time I have shut down 1 P & W due low oil and had one hydraulic system failure after which the gear came down good as gold.
Typically 20 minutes to 35,000 even when using reduced climb power then cruise at M.86...smile every time I go to work
