You really, really need to read more or be more astute. First of all, the oldest on the court is a Dem, Ginsburg who has had cancer. Kennedy, who is a swing judge is 80 and most likely to retire this summer. Breyer, a liberal, is 78. Thomas (a black conservative) is 68. Alito is 67. Sotomayor is 62. Roberts is 62. Kagan is 57. I believe Gorsuch is 48.
So, the next likely after Kennedy is Ginsburg followed by Breyer, both very liberal. If they are all replaced, the courts shifts strongly to the right and with young justices appointed, likely to stay that way for a long time.
So the oldest members of the court are old white liberals.