Yes, senior citizen discounts do apply to jeepney fares in the Philippines. According to Republic Act 9994, senior citizens are entitled to a 20% discount on public transportation, including jeepneys. To avail of this discount, seniors must present a valid senior citizen ID to the driver. It's always a good idea to confirm with the driver beforehand, as policies may vary by location. For more detailed information, you can visit the official government website or consult local transport authorities.