They look to be two slightly different ages. The rear is an original Ti-Glide shown by the smooth driveside flange (later ones had a wave in them) and the fact that the bearing is exposed on the non driveside (later ones had shields like on the front hub). Probably 96-97?
The front looks to be a lightweight (they came in three forms: Lightweight/Ultralight, Standard and Suspension/Fatso), but it looks to be later than the rear due to the shields on the bearings. 97-98? I would look to the rims to be the judge of when the wheels were built as they are from late nineties also - unfortunately I am not too versed with late nineties as its a bit too late for me!
No. I moved to Denmark in late 94 and plenty of people were using them at races in the UK that summer. IIRC Ti-glides came out in 93.
I bought a screw-on hub together with my Dave Yates frame at Neil Waltons (who'sjust retired from managing another bike shop), which would have been late 92 and it was one of the first. The ti-glide came very soon after that.
I got my Ti-glide in mid-late 94 and it had open dustcap on NDS. The one pictured with original decals and closed dustcap on NDS is late 94 which is round the time I moved to Denmark - I distinctly remember seeing them for the first time in the window of Fabin Sport in Roskilde.