OMG Star! That is one of the BEST looking 16 yr old Siamese - look at the coat - its still LIGHT on the body! A lot of siamese (especially the seals) tend to have almost a solid looking dark body by that time. She must have some nice Siamese lines in the background to retain the light body.
Would almost guess there could be Singa lines in there somewhere - that cattery produced the whitest coats on Siamese in the 50's/60's and retained the light body well into years