Actor Mark Ruffalo celebrated a special milestone on social media as his son, Keen, reached the age of 23. Ruffalo shared a collection of photos on Instagram, expressing his pride in Keen's journey and accomplishments. The post featured heartwarming pictures of Keen from his early years, showcasing moments of bonding between father and son in natural settings. Additionally, Ruffalo posted a recent image of them both, smiling in front of a mosaic wall, emphasizing Keen's strong resemblance to his father, particularly in their long, curly hair and cheerful smiles. Ruffalo captioned the post, 'Happy Birthday, Keen. Love you deeply and am so proud of everything you've achieved this year. Keep pushing forward.' This message reflects his profound love and respect for his son. Mark Ruffalo and his wife, Sunrise Coigney, have three children: Keen, Bella (18), and Odette (16). The actor, famous for his roles in films such as Spotlight and Avengers, frequently shares his affection for his family and their influence on his life. Earlier this year, in February, Ruffalo marked a career milestone with his family present as he was honored with a star on the Hollywood Walk of Fame, as reported by People magazine. The event was filled with heartfelt moments, including a candid photo of the family enjoying the celebration. Throughout his time as a father, Ruffalo has continually commended his wife, Sunrise Coigney, for her steadfast support and commitment to their family, calling her 'just a hero.'