Frankie Valli, the 90-year-old legendary singer of the Four Seasons, has raised concerns among fans after a viral video showed him struggling to lip-sync during a performance at the Mountain Winery in Saratoga on August 3. The footage, which has garnered over 4.1 million views, depicts Valli appearing frail as he climbs the stairs to the stage and attempts to perform his 1978 hit 'Grease'. Despite the concerns, Valli's representatives have assured fans that he is 'just fine' and enjoying performing, stating, 'Frankie is doing what he loves to do at 90.' Many fans expressed worry about his health, with some suggesting he should retire, while others praised his dedication to music. Valli is currently on his farewell tour, 'The Last Encores,' which has dates extending through April 2025. Amidst mixed reactions, the singer's enduring legacy and devotion to his craft remain evident.