Softened Bob

You are correct in that very severe haircuts can make a woman look older. As we age, a softened look is often more flattering because it adds movement and texture. The good news is that a bob can be softened in a number of ways without losing its classic shape.
Adding Layers
How you soften the look is determined by the needs of your specific hair type, face shape, and styling preferences. Is the problem simply a matter of hard edges and straight lines in otherwise flat hair? Then you might consider adding surface layers, where the top layers of the hair are cut to add movement while the perimeter of the haircut remains solid. This allows you to create volume where needed and add a gentle wave to the hair without sacrificing the clean outline of the bob.If your hair has lost some fullness over the years, subtle internal layering can help create the illusion of thicker, livelier hair. Rather than making the haircut look choppy, these hidden layers provide lift at the crown and encourage the hair to move in a natural way. However, if your hair is extremely fine or sparse, keep layering minimal. Too many layers can make the ends look thin and wispy rather than full.
Softening the Outline
If flatness isn't the issue, another option is to soften the outline of the haircut itself. Instead of leaving the ends blunt, your stylist can bevel the cut line using an undercutting technique: taking thin sections of hair and cutting the ends at a slight angle. This removes just enough bulk from the perimeter to create a gentle, slightly curved-in finish while maintaining the overall bob shape.If that still doesn't provide the desired softness, the ends can be textured using a point-cutting technique or, when appropriate for your hair type, a razor tool. But be careful, since razors are best avoided on very fine or naturally frizzy hair. Texturizing removes excess weight from the ends and allows hair to move more freely. This is especially effective for thick, straight hair that tends to look heavy or helmet-like when cut bluntly.

Part, Bangs and Hair Length
The placement of your part can also make a difference. A deep side part or a slightly off-center part usually creates more lift and movement than a hard center part.Likewise, adding soft, face-framing pieces around the cheeks or jawline - or introducing soft curtain bangs or a wispy, side-swept fringe - can balance facial features and instantly diffuse a severe shape.
The length of the bob also influences how soft it looks. A blunt, jaw-length bob tends to appear more rigid, while a long bob that falls just below the chin or grazes the collarbone has more natural sway and is often very flattering on mature faces.
Hair Color & Styling Products
Hair color and daily styling choices also contribute to the overall effect. Solid, dark, or one-dimensional color may emphasize sharp lines, whereas subtle highlights, lowlights, or dimensional color add depth and visually break up the outline.Finish the look with lightweight products - like a dry texturizing spray or a tiny dab of hair oil on the ends - rather than stiff hairsprays, ensuring your bob stays fluid, soft, and touchable all day.
©Hairfinder.com
See also:
The basics of the bob haircut
Are bob hairstyles ok for older women or will it makes us look even older?