They mean long life. I remember you liked the calligraphy at the Palace Museum.
长命百岁。我记得上次去故宫,你特别喜欢书法。
If you wish good advice, consult an old man.
如要忠告向老人请教。
As no pumas had been reported missing from any zoo in the country, this one must have been in the possession of a private collector and somehow managed to escape.