My face “melts” into neck, how can I achieve a more defined jawline? (Photos)

As per my question I find that as I’ve got older my face is now blending/melting into my neck, making my jawline invisible when viewed from the side. I don’t feel like my chin is particular weak or recessed, therefore I’d love to know what I can do surgically to permanently change this so as my jawline is both visible and defined. Thanks!