Dragongirls cames in all shapes and forms - Ira being one example of a red dragon. Pyra is one of Ira's older friends, a more experienced red dragon (if you couldn't tell by her looks XD)
This fine exemplar of dragongirl is one variant of red dragongirl a bit older (never ask a lady her age, she'll burn you). You can notice as they get older as their... proportions become more defined and the scales grows in different shapes, suggesting how strong their magic grown over the years.
Other characteristics dragongirls experience as they get older is their "heat cycle".
Many dragonslayers keep track of when older dragongirls are about to enter on heat to prepare themselves - through a rigorous training and preparation - to stave off the dragongirl from cities and villages. Its said when they go unchecked, they go on a spree capturing cute guys and dragging them to their nests. Its said men are kept for days until the dragongirl releases them: they're often severely malrounished and exhausted from the experience, albeit with a new kink for demihumans. That's why the dragonslayer guild takes this issue very serious and sends their best hunters to stop the "dragon milfs" ahead of time.
Remember: don't engage with dragonmilfs. Let the professionals handle it!