Penny Lancaster penned a sweet update shortly after rocker husband Rod Stewart shocked fans with a candid health admission. Just days ago Stewart, 79, admitted he’s “aware my days are numbered” as he reflected on his age. The Maggie May singer has enjoyed a decades-long career and even confessed recently he has no plans to retire, but he told The Sun last week: “We have all got to pass on at some point, so we are all in the same basket. “I am going to be enjoying myself for these last few years as much as I can.” He also noted: “I’m aware my days are numbered but I’ve got no fear.” A day later…